Date: Fri, 4 Apr 2003 13:25:57 -0500 From: Mathew Kanner <mat@cnd.mcgill.ca> To: freebsd-current@freebsd.org Subject: midi problem, an isa device on a pci card Message-ID: <20030404182557.GK17533@cnd.mcgill.ca>
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Hello,
I've been fiddling with pci drivers in freebsd for a couple of
months and up to now everything has ok, I did a midi driver for es137x
which was relatively easy because the io was done on the pci bus. I
was very pleased that there were enough resources for a newbie like me
to dive into kernel hacking.
Now I want to do one for the cmi card, but it seems to offer
the midi device on the isa bus, as does a bunch of cards. I'm sure
they did this to confuse me.
Linux seems to be happy just inb,outb in their pci driver,
which seems uncool to me. Also since I can program the mpu to appear
to different locations I think the ISA bus driver can help determine
the best one to use...
Theory of Reality (mostly hand waving, as I've done no code yet)
Drivers:
cmi(pci), my pci sound, it's on board btw.
mpushim(isa), the mpu401 from the tree but hacked to receive
from the pci soundcard driver
How I think should work:
probe cmi,
attach cmi,
do {
enable mpu401 at port region,
probe attach mpushim
while ( ! mpushim attached )
done
Big question mark:
How do I create isa devices from a pci device. Do I search up the
soundcard tree for the pci bus then search down for the isa bus, then
create_child(..."mpushim")?
How do I tell the shim before the probe/attach what io region to look
at, do I fiddle with ivars (or some internal structure), do I mess with hints
via kenv(9) [Is there a kenv(9)? ]
I think that these questions equally apply to joysticks.
Thanks,
--Mat
--
Brain: Are you pondering what I'm pondering?
Pinky: I think so, Brain, but if the plural of mouse is mice, wouldn't
the plural of spouse be spice?
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